What does Compressed Real-Time Transport Protocol (CRTP) compress ?

A. RTP, TCP, and IP headersB. RTP headersC. RTP, User Datagram Protocol (UDP), and IP headersD. Real-Time Transport Control Protocol (RTCP) headersCorrect Answer: CSection: Voice VideoExplanationExplanation/Reference:WAN links use RTP header compression to reduce the size of voice packets. This is also called Compressed RTP (cRTP), which is defined in RFC 2508. Asshown in Figure 14-18, cRTP reduces the IP/UDP/RTP header from 40 bytes to 2 or 4 bytes (a significant decrease in overhead). cRTP happens on a hop-by-hopbasis, with compression and decompression occurring on every link. It must be configured on both ends of the link. It is recommended for slow links up to 768kbps. cRTP is not used much anyone because slow WAN link bandwidths are seen less. Higher speed links are not recommended because of the high CPUrequirements and they reduce call quality.